That's a good idea. Both IJH and Vanguard's (VO) have beaten the S+P 500 longer term. I have some in the Total Stock Market ETF (VTI), so that includes the broader mid and small cap landscape, but I've been thinking about adding a mid cap ETF also.
Mid caps are also a great 'hunting ground' for stock pickers, with way less risk than the micro caps, and stronger balance sheets, proven management teams, actual revenues and earnings, etc.
I see that Investopedia defines mid caps as having $2-10 bil market caps. I had it split into Small Caps (1-5 bil) and Mid caps (5-15 bil), though there has been some slippage higher in all categories over the years due to the long bull market.
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